Arsene Wenger’s men head into the game fresh from their 2-0 victory over Bournemouth in the top flight last weekend and in third place in the table.
The Gunners are currently five points behind the high-flying Foxes as they prepare to welcome Claudio Ranieri’s men to The Emirates and know that a win would move them to within two points of top spot heading into the final 12 games of the season.
Leicester have been in fine form in recent weeks and continued to prove their doubters wrong with a stunning 3-1 win at Manchester City last weekend.
However, former Arsenal man Merson is backing the home team to have too much for the Foxes on Sunday lunchtime.
Writing in his column for Sky Sports, Merson said: Arsenal have to win this game for me but they are set up perfectly for Leicester, exactly the same as Man City were last week. Arsenal will have loads of the ball and then bang, Leicester will hit them on the counter.
“Leicester absolutely slaughtered City so Arsenal have got to be careful. They are nowhere near as good a team as Arsenal but they play a certain way which can majorly hurt them.
“This game will come down to how the first 25 minutes pans out. If Arsenal score early I fancy them to run away with it but if they don’t I fancy Leicester.
“Arsenal will continue to bomb forward for a goal and that plays right into the hands of the league’s best counter attacking side.
“However, having said that, Arsenal’s class should prevail, but it wouldn’t shock me one iota if Leicester won.”
Arsenal, who finished third last season, have won the FA Cup for the last two years.
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